Gilead Receives Complete Response Letters From U.S. FDA for Elvitegravir and Cobicistat

From Gilead Sciences, Inc.

April 29, 2013

Foster City, Calif. (Business Wire) -- Gilead Sciences, Inc. (Nasdaq: GILD) today announced that the company has received Complete Response Letters from the U.S. Food and Drug Administration (FDA) for its New Drug Applications (NDAs) for elvitegravir and cobicistat for use as part of HIV treatment regimens.

In its communications, FDA states that it cannot approve the applications in their current forms. The letters state that during recent inspections, deficiencies in documentation and validation of certain quality testing procedures and methods were observed. Gilead is working with FDA to address the questions raised in the Complete Response Letters and move the applications forward.

Elvitegravir and cobicistat are also components of Gilead's once-daily single tablet HIV-1 regimen Stribild® (elvitegravir 150 mg/cobicistat 150 mg/emtricitabine 200 mg/tenofovir disoproxil fumarate 300 mg), which was approved by FDA in August 2012 for treatment-naïve adults. This regulatory action does not affect the marketing authorization or continued use of Stribild.

Gilead submitted its NDAs for elvitegravir and cobicistat in June 2012. Marketing applications are also pending in Europe.

About Elvitegravir

Elvitegravir is a member of the integrase inhibitor class of antiretroviral compounds. Integrase inhibitors block the ability of HIV to integrate into the genetic material of human cells. Elvitegravir was licensed by Gilead from Japan Tobacco Inc. (JT) in March 2005. Under the terms of Gilead's agreement with JT, Gilead has exclusive rights to develop and commercialize elvitegravir in all countries of the world, excluding Japan, where JT retains rights.

About Cobicistat

Cobicistat is Gilead's proprietary potent mechanism-based inhibitor of cytochrome P450 3A (CYP3A), an enzyme that metabolizes drugs in the body. Unlike ritonavir, cobicistat acts only as a pharmacoenhancing or "boosting" agent and has no antiviral activity.

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